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Just FYI, milbemycin, the active ingredient in Interceptor, is also on the list of MDR1 "caution" drugs (there is a full list available at the WSU website). Not sure why the misinformation persists that ivermectin is the only heartworm preventative that can cause problems. In any case, the dosages of these drugs used for heartworm prevention is low enough to be safe for MDR1 affected dogs, anyway.
 
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